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A Septendecillion (1 Septendecillion) is 10 to the power of 54 (10^54). This is a giant number!

How many zeros in a Septendecillion?

There are 54 zeros in a Septendecillion.

What's before Septendecillion?

A Sedecillion is smaller than a Septendecillion.

What's after Septendecillion?

A Octodecillion is larger than a Septendecillion.


A Septendecillionaire is someone whos assets, net worth or wealth is 1 or more Septendecillion. It is unlikely anyone will ever be a true Septendecillionaire. If you want to be a Septendecillionaire, play Tap Tales!

Is Septendecillion the largest number?

Septendecillion is not the largest number. Infinity best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.

Septendecillion written out

Septendecillion is written out as:


Big Numbers

This is just one of many really big numbers!

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